PLATE XVII. 
Lichas (Tehataspis) grandis. 
Page 73. 
See Plates 18 and 19. 
Fig. 1. Profile of the cephalon represented on plate 18, showing the elevation of the glabella and one of 
the glabellar spines; the occipital ring, and the constriction about the base of the frontal lobe. 
Upjier Heldej-berg limestone. Cayuga, Province of Ontario. 
Fig. 2. Dorsal view of a much weathered specimen of the cephalon, wanting the free cheeks. 
Fig. 3. Prottle of the same. 
Schoharie grit. Schoharie, Schoharie coimty. 
Fig, 4. The posterior poi'tion of a large cephalon, showing the prominent lateral lobes and bases of the 
double glabellai’spines, and the brojvf occipital ring with the clavate pi'ocesses upon its posterior 
margin. The base of a strong spine lying just within the palpebral fui'row, which is shown in 
the specimen, is not represented in the figure. 
Fig. 5. The same viewed from behind, showing the elevation of the latei-al lobes and of the processes 
upon the occipital ring. 
Schoharie grit. Schoharie, Schoharie county. 
Fig. 6. An impei’fect pygidium, showing the pleural annulations and a portion of the marginal spines. 
Schoharie grit. Schohane county. 
